Magneto-dielectric characterization of TiO2-CoFe2O4 derived ceramic composites
2018
Dielectric permittivity (e′), magnetic permeability (μ′) and dielectric and
magnetic loss (tan δe and tan δμ, respectively) of magneto-dielectric cobalt
ferrite-titania (CFO-TO) ceramic composites are determined from 200 to
300MHz. The four different combinations of phases - that can be produced in
the sintered composite, according to the starting CFO/TO molar ratio - allow
to tune the macroscopic permittivity and permeability. For the first time
impedance, miniaturization and magneto-dielectric loss of the four classes
of composites are calculated and discussed. The displayed miniaturization
factors between 4.4 and 8.2 in the very-high frequency (VHF) range
corroborate their potential application as magneto-dielectric substrate
materials for antennas. Remarkably, the ceramic composites characterized by
2 vol.% and 3 vol.% of CFO and TO, respectively, dispersed in Fe2CoTi3O10
(FCTO) matrix display a magneto-dielectric loss lower than 0.07 and a
miniaturization factor of 4.8.
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